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A fluorescent Eu(III) MOF for highly selective and sensitive sensing of picric acid

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Abstract

A metal-organic framework [Eu3L3(CH3COO)2(H2O)2(μ3-OH)]•3DMF, (EuL, H2L=9H-carbazole-2,7-dicarboxylic acid, DMF=N,N-dimethylformamide) has been synthesized under solvothermal conditions and structurally characterized. In EuL, Eu6O8 clusters are four-bridged by carboxylates to form parallel-aligned Eu–O–C chains, which are further linked by the carbazole moieties of L2− ligands to form the three-dimensional framework with rhombic channels. The EuL material with characteristic emission of Eu3+ ion exhibits significant luminescence quenching response for picric acid (PA) and the linear Stern-Volmer plot was observed in the concentration range of 0.05–0.15 mM with Ksv of 98074 M−1. As far as we know, this Ksv is among the highest values for COFs and MOFs in detection of PA. The excellent anti-interference ability and repeatability were also verified by experiments. Lastly, we investigated the luminescence quenching mechanism in the EuL sensing system.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (61575096), Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD) (YX03001), Jiangsu Province Double Innovation Talent Program (090300014001), Nanjing University of Posts & Telecommunications (NY212004, NY217074), and Postgraduate Research & Practice Innovation Program of Jiangsu Province (KYCX17_0748 and KYCX18_0857).

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Authors and Affiliations

  1. Key Laboratory for Organic Electronics and Information Displays & Jiangsu Key Laboratory for Biosensors, Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing University of Posts & Telecommunications, Nanjing, 210023, China

    Qianqian Chen, Jiahui Cheng, Liang Li, Zhipeng Liu, Xinhui Zhou, Yujian You & Wei Huang

  2. Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (NanjingTech), Nanjing, 211816, China

    Liang Li

  3. Shaanxi Institute of Flexible Electronics (SIFE), Northwestern Polytechnical University (NPU), Xi’an, 710072, China

    Wei Huang

  4. School of Telecommunication and Information Engineering, Nanjing University of Posts & Telecommunications, Nanjing, 210023, China

    Jin Wang

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  1. Qianqian Chen
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  2. Jiahui Cheng
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  3. Jin Wang
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  4. Liang Li
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  5. Zhipeng Liu
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  6. Xinhui Zhou
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  7. Yujian You
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  8. Wei Huang
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Correspondence to Xinhui Zhou or Wei Huang.

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Chen, Q., Cheng, J., Wang, J. et al. A fluorescent Eu(III) MOF for highly selective and sensitive sensing of picric acid. Sci. China Chem. 62, 205–211 (2019). https://doi.org/10.1007/s11426-018-9367-y

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  • DOI: https://doi.org/10.1007/s11426-018-9367-y

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